A rail apparatus includes first plate formed of a synthetic material having a first face and a second face opposite the first face, the first plate having a plurality of rows of spaced apart rail protrusions in a first pattern protruding from the second face of the first plate. To this end, an image is loaded onto a RAM, and the contrast and color balance of the input image are corrected. The comparator is configured to provide an output signal indicative of whether or not the level of the measured phase current is below the reference phase current. The first and second horizontal supports are vertically adjustable with respect to the posts.